The objective of this Distribution Transformer Handbook is to facilitate the selection, ordering andoperation of distribution transformers.The target readers are personnel involved in the various stages of a transformer’s service life, fromplanning the investment to the disposal of the transformer after use. It may also be useful to ABBpersonnel.The handbook is arranged with the sections following the transformers life from planning throughordering, installation, operation, maintenance and scrapping.Other useful information, including more theoretical topics, may be found at the end of thishandbook.Navigation through this handbook is facilitated through a three level contents following thisforeword, and the index at the end.ABB Power Technologies Division thanks the International Electrotechnical Commission (IEC) forpermission to reproduce information from its International Standards. All such extracts arecopyright of IEC, Geneva, Switzerland. All rights reserved. Further information on the IEC isavailable from www.iec.ch. IEC has no responsibility for the placement and context in which theextracts and contents are reproduced by ABB Power Technologies Division; nor is IEC in any wayresponsible for the other content or accuracy therein."The standards, IEC, CENELEC, IEEE, mentioned in the text refer to the edition given in the list ofstandards. For practical use only latest editions of the standards should be used.Extracts from the ABB Switchgear Manual are quoted by kind approval by the issuer.UK English has been selected for this document to comply with the text in IEC standards.